Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: eisbar on October 06, 2013, 10:23:17 pm
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Hi,
I salvaged a working Nanao MS-2932 (31KHz) monitor out of a water-damaged Crazy Taxi today. I didn't pay attention while I was pulling apart all the wiring harnesses (because I didn't intend to put the cab itself back together), and am a little fuzzy on connecting things back up.
First, I'm wondering if this monitor needs an isolation transformer, or if it's okay with being fed 120v right from the wall. There is a transformer screwed to the wood near the power supply, but I *think* it's a step-down transformer, as the label says pri: 120v 60hz top, sec: 12.5v @ 6.0A bottom. So I assume it isn't related to the monitor - but confirmation would be good before I fry something.
In terms of connecting it, I'm going to use it with a MAME PC outputting 640x480 @60Hz. This was tested before I picked up the monitor (using a VGA cable), and worked well. But I unplugged other AMP-style connectors from the monitor besides power, and am wondering what I need to hook back up.
One of the connectors is three-prong, with black (brown?), white and green wire. The green is then grounded on the chassis, so I assume this is the incoming power feed. Confirmation from someone who knows this monitor would again, be great :) I'm guessing the other connectors are for RGB and sync, for if you're not using the VGA cable? Anyone know if there's anything that needs to be connected, aside from power and the separate VGA DB15 cable?
Thanks - attaching a picture in case it helps.
Eisbar
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Okay, I managed to figure things out on my own. I'll post what I found in case it helps someone searching for information about the same monitor.
There is no isolation transformer required for this monitor. I gleaned that from a number of posts where people with Naomi Universal cabinets (which used either this monitor or a Sanwa equivalent) all agreed that their cabinet had no iso.
There are three AMP-style connectors feeding into a large 4x4 grid connector for the display:
- One has three wires (black/white/green) - this is the AC power supply
- One has brown and white wires - this is for wiring up a momentary switch to trigger the degauss function (which all my previous screens did automatically)
- One has five wires, R, G, B and B/W. You can guess what this one is for :) (I'm not using it, I'm feeding video signal via the handy DB15 connector).
The thinness of wire gauge on the AC power supply made me a little nervous until I stripped a PC power cable and realized it was nearly identical. Easily spliced so that I can supply power directly from the wall, and remove the rusted Sega PS from the equation.